Barking machine



A. T. TIDBLAD Nov. 15, 1932.

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Filed April 4. 1930 3 Sheets-Sheet 3 Patented Nov. 15, 1932 UNITED STATES ANDERS TYCHO. TIDBLAD, OF SODERHAMN, SWEDEN BARKIN G MACHINE Application filed April 4, 1980, Serial No. 441,631, and in Sweden February 20, 1929.

This invention relates to a simplified and considerably improved debarking machine for the debarking of so-called paper-wood.

An embodiment of the invention is shown in the accompanying drawings in which Fig. 1 shows a side view,

Fig. 2, a transverse section, and

Fig. 3, a longitudinal section through the so-called debarking drum or cylinder;

Figs. 4, 5 and '6 show details.

1a and 16 indicate two cooperating debarking drums which in a usual way are r0- tatably located in journals 2 and provided with a belt path 3 so that they can be r0- hated by means of a belt transmission. In the drums there are mounted arms 4 which are directed obliquely inwards toward the center of each drum. In the interior, the free ends of these arms carry the debarking members, one member to every arm. The said members may consist either of toothed steel wheels 5, Fig. 5, or steel brush wheels 6, Fig. 6, journalled on a shaft in each arm 4, so that they may rotate thereon. F ig. 4 shows how the wheels are journalled in the respective arms 4. By resilience of the arms themselves or of the plate-springs 7, Fig. 4, fixed in any suitable manner within the drums, the debarking members are pressed against the log fed between them. I

When the drums rotate and the 10 is fed through the same, the scraping mem ers rotate around the log along a screw line with a very low pitch. Every point of the surface of the log will thus be subjected to the debarking procedure or action. In order to increase the effect of the scraping members, their axes are directed obliquely across the log, see Figs. 3 and 4. 40 No feeding device is shown as it may be of any known kind.

In order that the scraping members shall be adapted to be more easily adjusted to the surface of the log when the log is curved, the arms 4 are not directly fixed in the drum, but in a ring 10 which is journalled in a Car dan way or universally mounted in the drum, by means of journals 11 and 12 and a ring 13. Springs'l4 serve to centre the ring 10.

The debarking machine shown in Fig. 1

is provided with a scraping device 5 and a brush device 6 journalled in the separate drums 1a, 1b, the brush device 6 following the scraping device 5, arranged in the feeding direction of the log. During operation, the two drums 3 rotate in opposite directions. The scraping device 5 liberates the log from the thick bark and loosens the remainder which is then removed by the brush device 6. Dark layers on the bark which may have arisen on account of certain spots of the log having been earlier exposed to the air are also removed by the brush device 6, which thus performs a very important function. .The debarking machines known hitherto have been constructed without attention having been paid to this function. By the combination of scrapers and brushes the log is subjected to a very efl'ective debarking procedure, i. e. it is debarked in a usual sense, but it is also subjected to an intensive brushing which liberates it from remaining bark and from dark layers if any, so that the log becomes quite clean.

Having now described my-invention, what I claim as new and desire to secure by Letters Patent is:

1. A bark-removing machine comprising a drum; a ring universally mounted in said drum; and a plurality of debarking members mounted in said ring, saiduniversal mounting readily curved logs.

2. A bark-removing machine comprising a rotatably-mount'ed drum; an inner ring in said drum; means for universally mounting said ring in said drum; and a plurality of debarking members mounted in said ring, said universal mounting readily permitting the debarking of curved logs. 3. A bark-removing machine comprising a rotatably-mounted drum; an inner ring in said drum; an intermediate ring between the inner ring and the drum and interconnected to provide a universal mounting for the inner ring in the drum; and a plurality of debarking members mounted in said inner ring, said universal mounting readily permitting the debarking of curved logs.

4. A bark-removing machine comprising a permitting the debarking of drum; and a plurality of debarking members universally mounted in said drum and each a member comprisinga plurali of sons 'ers mounted on an axisobhque tot e axis the, 5 drum, said universatmoun f readily permitting the debarking'of curve logs. f

5. A bark-removing machine comprising a. Y

rotatably-mounted drum; an inner ring insaid drum; an intermediate ring between the 1 inner ring and the drum and interconnected to provide a universal mounting for the inner ring in the drum; a plurality of debarking members mounted in said inner ring. said universal mounting readily permitting the debarking of curved logs; and a plurahty of springs mounted on the inner ring and contacting with the drum adapted to center the v inner ring in the drum. I

In witness whereof I have hereunto signed my name;

ANDERS TYGHO TIDBLAD. 

